Lac Arcastre is a Lake located in Lac-Walker; Sept-Rivières, Quebec.

• Latitude: 50° 54' 28'' North   (decimal: 50.9077778)
• Longitude: 67° 13' 59'' West   (decimal: -67.2330556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Walker; Sept-Rivières
• Atlas of Canada Locator Map: Lac Arcastre
• GPS Coordinate Locator Map: Lac Arcastre Lat/Long